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When you define an event in the Business Event System, you can assign the event a Generate function that can produce the complete event data from the event name, event key, and an optional parameter list. The event data gives additional details to describe what occurred and can be structured as an XML document. You should specify a Generate function if the application that raises the event will not produce the event data itself.

When an event is raised locally, the Event Manager checks each subscription before executing it to determine whether the subscription requires the event data. If the event data is required but is not already provided, the Event Manager calls the Generate function for the event to produce the event data. The Generate function returns the event data in character large object (CLOB) format.

Note: If the event data is required but no Generate function is defined for the event, Oracle Workflow creates a default set of event data using the event name and event key.

Note: If the Generate function is costly, and you want to return control to the calling application more quickly after raising the event, you can defer all the subscriptions that require the complete event data. Then the Event Manager will not run the Generate function until those subscriptions are executed at a later time. See: Deferred Subscription Processing.

The PL/SQL function that generates the event data must have the following standard API:

function <function_name> (p_event_name in varchar2,
                          p_event_key in varchar2
                          p_parameter_list in wf_parameter_list_t
                                 default null)
                           return clob;

The arguments for the function are as follows:

See Also

To Define an Event Subscription

Parameter List Structure, Oracle Workflow API Reference

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